一、介紹:
本文章是通過java項目連接Canal客戶端獲取,Canal通過模擬從庫dump下來的BINLOG二進制文件數據。
二、引入pom文件:
<dependency>
<groupId>com.alibaba.otter</groupId>
<artifactId>canal.client</artifactId>
<version>1.1.1</version>
</dependency>
三、Test方法測試
import com.alibaba.otter.canal.client.CanalConnector;
import com.alibaba.otter.canal.client.CanalConnectors;
import com.alibaba.otter.canal.protocol.CanalEntry;
import com.alibaba.otter.canal.protocol.Message;
import com.google.common.collect.ImmutableMap;
import com.google.common.collect.Lists;
import com.google.common.collect.Ordering;
import org.apache.commons.codec.digest.DigestUtils;
import org.apache.commons.collections.CollectionUtils;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.http.HttpEntity;
import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpMethod;
import org.springframework.http.ResponseEntity;
import org.springframework.http.client.SimpleClientHttpRequestFactory;
import org.springframework.web.client.RestTemplate;
import java.net.InetSocketAddress;
import java.nio.charset.Charset;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;
@SpringBootApplication
public class TestCanal {
@org.junit.Test
public void getEntries() {
CanalConnector connector = CanalConnectors
.newSingleConnector(new InetSocketAddress("10.179.251.***", 11111), "example", "", "");//寫入正確的ip和端口以及destination
int batchSize = 1000;
connector.connect();//獲取連接
connector.subscribe(".*\\..*");//通配此處不做更改
connector.rollback();
try {
while (true) {
Message message = connector.getWithoutAck(batchSize);//獲取指定數量的數據
long batchId = message.getId();
int size = message.getEntries().size();
if (batchId == -1 || size == 0) {//當message.getId不等於-1或0時代表監控到了數據
} else {
printEntry(message.getEntries());//具體分析數據類,可根據自己需求進行修改
}
connector.ack(batchId); // 提交確認
}
} finally {
connector.disconnect();
}
}
private void printEntry(List<CanalEntry.Entry> list) {
for (CanalEntry.Entry entry : list) {
if (entry.getEntryType() == CanalEntry.EntryType.TRANSACTIONBEGIN
|| entry.getEntryType() == CanalEntry.EntryType.TRANSACTIONEND) {
continue;//如果是事務跳過
}
CanalEntry.RowChange rowChage = null;
try {
rowChage = CanalEntry.RowChange.parseFrom(entry.getStoreValue());//獲取修改的數據row
} catch (Exception e) {
}
CanalEntry.EventType eventType = rowChage.getEventType();//獲取類型 增刪改
if (entry.getHeader().getSchemaName().equals("mdata_dashboard")) {//庫名
if (entry.getHeader().getTableName().equals("import_second_request_volume")) {//表名
System.out.println("changed.");
//取值根據表數據自行定義修改
List<String> deleteUserId = new ArrayList<String>();
List<String> updateUserId = new ArrayList<String>();
for (CanalEntry.RowData rowData : rowChage.getRowDatasList()) {
if (eventType == eventType.DELETE) {
deleteUserId.add(rowData.getBeforeColumnsList().get(1).getValue());
} else if (eventType == eventType.INSERT || eventType == eventType.UPDATE) {
updateUserId.add(rowData.getAfterColumnsList().get(1).getValue());
updateUserId.add(rowData.getBeforeColumnsList().get(1).getValue());
}
}
}
}
}
}
}
如果只想獲取字段數據
/**
* 處理數據
*
* @param list
*/
private void printEntry(List<Entry> list, long batchId) {
CryptCenterHandlerInvokeProxy proxy = ApplicationContextCapture
.getBean(CryptCenterHandlerInvokeProxy.class);
for (Entry entry : list) {
if (entry.getEntryType() == EntryType.TRANSACTIONBEGIN
|| entry.getEntryType() == EntryType.TRANSACTIONEND) {
continue;//跳過事務
}
RowChange rowChage = null;
try {
rowChage = RowChange.parseFrom(entry.getStoreValue());//獲取變更的row數據
} catch (Exception e) {
}
EventType eventType = rowChage.getEventType();//獲取變動類型
entry.getHeader().getSchemaName();//獲取變動庫名
entry.getHeader().getTableName();//獲取變動表名
for (RowData rowData : rowChage.getRowDatasList()) {
Map<String, Object> columnMap = new HashMap<String, Object>();
if (eventType == EventType.DELETE) {
columnMap = printColumn(rowData.getBeforeColumnsList());
} else if (eventType == EventType.INSERT) {
columnMap = printColumn(rowData.getAfterColumnsList());
} else {
columnMap = printColumn(rowData.getAfterColumnsList());
}
}
}
}
/**
*獲取map 字段名,字段值, column.getUpdated()是否被更新等等,按需要進行取值
*/
private Map<String, Object> printColumn(List<CanalEntry.Column> columns) {
Map<String, Object> map = new HashMap<>();
for (CanalEntry.Column column : columns) {
map.put(column.getName(), column.getValue());
}
return map;
}
打印columnMap數據結果
{
interface_uri = /gateway/hr - basic / openApi / V2 / getStaffInfoByLdaps,
total = 844147,
day_at = 2,
hour_at = 18,
time_at = 20200602185630,
second_at = 30,
id = 10341,
minute_at = 56,
app_id = 181211329,
month_at = 202006
}
參考文章:https://www.jianshu.com/p/23f5db8b3e25?mType=Group&from=androidqq